diff options
author | Vinod Koul <vinod.koul@intel.com> | 2017-07-04 10:05:22 +0530 |
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committer | Vinod Koul <vinod.koul@intel.com> | 2017-07-04 10:05:22 +0530 |
commit | 3edc85023a1e1daf22d8e372c5c4f87dc4a04a71 (patch) | |
tree | 07e08db60bbddc02a00ff805d61cc0c709323ca2 /drivers/dma | |
parent | 2e76eba5e0f0e4535868ce41e0a8d28754d0db29 (diff) | |
parent | 33cb0880e0544c1553d37f4877fbd7a7a84f444f (diff) | |
download | linux-3edc85023a1e1daf22d8e372c5c4f87dc4a04a71.tar.bz2 |
Merge branch 'topic/rcar' into for-linus
Diffstat (limited to 'drivers/dma')
-rw-r--r-- | drivers/dma/sh/rcar-dmac.c | 27 |
1 files changed, 21 insertions, 6 deletions
diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c index db41795fe42a..d2cb4a0916e6 100644 --- a/drivers/dma/sh/rcar-dmac.c +++ b/drivers/dma/sh/rcar-dmac.c @@ -144,6 +144,7 @@ struct rcar_dmac_chan_map { * @chan: base DMA channel object * @iomem: channel I/O memory base * @index: index of this channel in the controller + * @irq: channel IRQ * @src: slave memory address and size on the source side * @dst: slave memory address and size on the destination side * @mid_rid: hardware MID/RID for the DMA client using this channel @@ -161,6 +162,7 @@ struct rcar_dmac_chan { struct dma_chan chan; void __iomem *iomem; unsigned int index; + int irq; struct rcar_dmac_chan_slave src; struct rcar_dmac_chan_slave dst; @@ -1008,7 +1010,11 @@ static void rcar_dmac_free_chan_resources(struct dma_chan *chan) rcar_dmac_chan_halt(rchan); spin_unlock_irq(&rchan->lock); - /* Now no new interrupts will occur */ + /* + * Now no new interrupts will occur, but one might already be + * running. Wait for it to finish before freeing resources. + */ + synchronize_irq(rchan->irq); if (rchan->mid_rid >= 0) { /* The caller is holding dma_list_mutex */ @@ -1363,6 +1369,13 @@ done: spin_unlock_irqrestore(&rchan->lock, flags); } +static void rcar_dmac_device_synchronize(struct dma_chan *chan) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + + synchronize_irq(rchan->irq); +} + /* ----------------------------------------------------------------------------- * IRQ handling */ @@ -1647,7 +1660,6 @@ static int rcar_dmac_chan_probe(struct rcar_dmac *dmac, struct dma_chan *chan = &rchan->chan; char pdev_irqname[5]; char *irqname; - int irq; int ret; rchan->index = index; @@ -1664,8 +1676,8 @@ static int rcar_dmac_chan_probe(struct rcar_dmac *dmac, /* Request the channel interrupt. */ sprintf(pdev_irqname, "ch%u", index); - irq = platform_get_irq_byname(pdev, pdev_irqname); - if (irq < 0) { + rchan->irq = platform_get_irq_byname(pdev, pdev_irqname); + if (rchan->irq < 0) { dev_err(dmac->dev, "no IRQ specified for channel %u\n", index); return -ENODEV; } @@ -1675,11 +1687,13 @@ static int rcar_dmac_chan_probe(struct rcar_dmac *dmac, if (!irqname) return -ENOMEM; - ret = devm_request_threaded_irq(dmac->dev, irq, rcar_dmac_isr_channel, + ret = devm_request_threaded_irq(dmac->dev, rchan->irq, + rcar_dmac_isr_channel, rcar_dmac_isr_channel_thread, 0, irqname, rchan); if (ret) { - dev_err(dmac->dev, "failed to request IRQ %u (%d)\n", irq, ret); + dev_err(dmac->dev, "failed to request IRQ %u (%d)\n", + rchan->irq, ret); return ret; } @@ -1843,6 +1857,7 @@ static int rcar_dmac_probe(struct platform_device *pdev) engine->device_terminate_all = rcar_dmac_chan_terminate_all; engine->device_tx_status = rcar_dmac_tx_status; engine->device_issue_pending = rcar_dmac_issue_pending; + engine->device_synchronize = rcar_dmac_device_synchronize; ret = dma_async_device_register(engine); if (ret < 0) |